US and Iran Joust over Nuclear Nonproliferation

Delegates from France, Britain and the US walked out of today's UN conference on the nuclear non-proliferation treaty. They were protesting a speech by Iran's President Mahmoud Ahmadinejad, who, after attacking the US, made a veiled reference to western support for Israel's nuclear weapons. In Washington, the White House said Ahmadinejad failed to address Iran's obligations and accused him of "wild accusations." Colum Lynch is UN correspondent for the Washington Post.